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# 80%of grade is 90, 20% is 80. How do I find out what the grade is?

Need answer asap. Thanks.

I'm not understanding the answers.

Do I add the 80 and 90 and divide by 2? I am given this chart A-s100-90, B is 89-80, Cis 79-70, D is 69-60 and F is less.

### 8 Answers

- MathMan TGLv 71 decade agoFavorite Answer
Let's look at it this way.

Overall you can get 100 points.

The first part is worth 80 points, the second part is worth 20 points.

On part one, you got 90 percent of the possible 80 points.

.90 x 80 = 72 points (out of the 80 possible)

On part two, you got 80 percent of the possible 20 points.

.80 x 20 = 16 points (out of the possible 20 points)

72 + 16 = 88 points out of the possible 100.

So you get a B.

Maybe a B+ if they're being generous.

=

- * Tinkerbell *Lv 51 decade ago
1) 80% of grade is 90

90 divided by 80% times 100% =200

2) 20% is 80.

20 divided by 80 times 100

=25

- Anonymous1 decade ago
80% + 20% = 100%

90 + 80 = 170

OR

what do you mean? 100%?

10% = 40, in other words half 80

100% = 400, 10% x 10

OR

20% x 5 = 100%

80 x 5 = 400

Source(s): my knowledge - How do you think about the answers? You can sign in to vote the answer.
- nozar nazariLv 71 decade ago
If the grade is X,then 0.8X=90,so the grade must beX= 90/0.8=112.5

and also 0.2X=80 so X=400.The question is NOT self-consistant.